64 
BRITISH ENTOMOSTRACA. 
“ wonderful insect which had but one eye,” found in the 
river Thames, with a “ head somewhat like that of a bird,” 
and “legs like the claws of an eagle ;” the large antennae 
are described as “ two branches, resembling the dugs of 
animals,” and which, he says, “ we might suppose were 
designed for suckling their young •” “for this insect,” 
he adds, “ is viviparous, which is contrary to other insects 
before mentioned ; for we did not only observe the young 
ones alive in the belly of the mother, but likewise saw 
several of them excluded from her body.” The figure 
which he gives is equally good as his description, both of 
them showing the force of imagination, for it is evident 
this “ wonderful insect” is nothing more than the 
Daphnia pulex. 
Trembley, in his ‘ Memoires pour servir a l’histoire 
d’un genre de Polypes d’eau douce/ 1744, takes notice 
of, and figures, a species of Daphnia under the name of 
j Vuceron branchu, which seems to be the favorite food of 
the polypus, as they devour them in great numbers. It 
is the Daphnia pulex, and his observations on this subject, 
and figures also, are quoted and copied by Adams, in his 
£ Micrographia Illustrata/ published in London, 1746. 
Linnaeus, in his ‘ Systema Naturae/ 4th edition, 1744, 
describes the same species shortly, under the name of 
Mono cuius pulex arbor escens, and in his ‘ Fauna Suecica/ 
1st edit. 1746, and ‘Entomologia Faunae Suecicae, 1789, 
he again describes it under the name of Monoculus pulex. 
Baker, in his ‘Employment for the Microscope/ 1st edit. 
1753, describes and figures a species, which is evidently 
the D. pulex. He maintains that it has two eyes, and 
severely handles poor Bradley for saying it has only one, 
though that is about the most correct part of his de- 
scription ! He quotes Swammerdam’s memoir, and retains 
his name for it, as expressive of its appearance and 
motion. 
Joblot, in his ‘ Observations d’Histoire Naturelle, faites 
avec le Microscope/ 1754, describes a species of Daphnia 
under the name of Pou aquatique , which Muller quotes 
